“On the ride home, it kept echoing in my head: I’m not a virgin anymore.” The blonde debutante also revealed the president did not kiss her on the mouth properly, but insists they were close.

The torrid affair continued long after that, she reveals.

They continued to meet in secret, taking baths together and sometimes spending the night with each other when she would wear his nightshirts.

As she promotes her book with its lengthy title, Once Upon A Secret: My Affair With President John F. Kennedy And Its Aftermath, she is justifying the affair by saying “resistance was out of the question”.

Now a 69-year-old retired church administrator, she explains: “The fact that I was being desired by the most famous and powerful man in America only amplified my feelings to the point where resistance was out of the question.

“That’s why I didn’t say no to the president. It’s the best answer I can give.”

Kennedy had countless affairs, including one with doomed film star Marilyn Monroe, who was also romanced by his younger brother Robert Kennedy.